Why does air in a room rise when it gains thermal energy from a heater? (1 point)
Responses
a Its molecules move around more slowly, so there is more space between them, making it less dense than the air above it.
b Its molecules move around more quickly, so there is more space between them, making it less dense than the air above it.
c Warm air always rises.
d Its molecules move around more quickly, so there is more space between them, reducing its mass.
1 answer
b Its molecules move around more quickly, so there is more space between them, making it less dense than the air above it.